On Interferometric Duality in Multibeam Experiments

Details On Interferometric Duality in Multibeam Experiments On Interferometric Duality in Multibeam Experiments

2003-01-07

arxiv.org/abs/quant-ph/0301017v2

J.Phys.A36:11481-11502,2003

Physics

Quantum Physics

26 pages, 1 figure, substantial changes in the text, new material has been added in Section 3. Version to appear in J.Phys. A

Scientific paper

10.1088/0305-4470/36/45/009

We critically analyze the problem of formulating duality between fringe visibility and which-way information, in multibeam interference experiments. We show that the traditional notion of visibility is incompatible with any intuitive idea of complementarity, but for the two-beam case. We derive a number of new inequalities, not present in the two-beam case, one of them coinciding with a recently proposed multibeam generalization of the inequality found by Greenberger and YaSin. We show, by an explicit procedure of optimization in a three-beam case, that suggested generalizations of Englert's inequality, do not convey, differently from the two-beam case, the idea of complementarity, according to which an increase of visibility is at the cost of a loss in path information, and viceversa.

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